A top Marine shares his secrets to keeping fit at 50

Tech Insider : Business
The US Marine Corps' top enlisted leader, Sergeant Major Carlos Ruiz, plays frisbee with Marines,
The US Marine Corps' top enlisted leader, Sgt. Maj. of the Marine Corps Carlos Ruiz, plays frisbee with troops,

GySgt Jordan E. Gilbert/US Marine Corps

'We're going to see a lot of carnage': VC investor says AI boom will create giants — and topple overhyped startups

Tech Insider : Business, Environment
A man near an electronic quotation board displaying the Nikkei 225 stock prices on the Tokyo Stock Exchange in Tokyo on November 5, 2025
Mel Williams, a partner and cofounder at TrueBridge Capital Partners, says the AI frenzy will mint a few giants while many overhyped startups collapse.

GREG BAKER/AFP via Getty Images

I'm 81 and can't retire, so I work a part-time job for $18 an hour. Regret is a waste of time.

Tech Insider : Economy, Business
Kathy Curtis
Kathy Curtis, 81, works part-time for her local water company to pay her bills.

Juan-Antonio Puyol/ BI

A neuroscientist is training to be a super-ager with 6 daily habits

Tech Insider : Business, Travel
a portrait photo of Dr. Majid Fotuhi, a smiling man with silver hair wearing a black suit and black tie in front of a dark background.
Dr. Majid Fotuhi, a neurologist and professor at Johns Hopkins University, said he has a daily routine to habits like Sudoku and morning exercise to help him become a Super-Ager.

Courtesy of Dr. Majid Fotuhi

I'm 82 and still working because my 401(k) ran out. Despite my health conditions, I like teaching young people.

Tech Insider : Economy, Business
David Hugo Barrett
David Hugo Barrett still works as a substitute teacher at 82, partly out of financial necessity.

Timothy Wolfer/ BI

The 3-part fitness formula for longevity, according to a top sports doctor

Tech Insider : Business, Sports
A smiling man with glasses and a blue button down shirt, Dr. Kevin Sprouse, sits at a desk in front of a soft focus wall of diplomas.
Dr. Kevin Sprouse has worked with elite athletes on optimizing performance for years. He said a good longevity routine should include strength training, intervals, and slow, steady cardio.

Courtesy of Eternal

She's 90 and helping her peers as a caregiver. Workers over 80 say helping each other is the best job they can get

Tech Insider : Economy, Business, Sports
Barbara Brown teaching Yoga
Barbara Brown, 83, still teaches chair yoga at nursing homes throughout Richmond, Virginia.

Laura Thompson for BI

Jiu jitsu is the new cult workout for men who want to feel younger and think sharper

Tech Insider : Business, Sports
a man doing jiu-jitsu on the left and a clock on the right
Jiu jitsu has skyrocketed in popularity with older athletes, from Hollywood celebs to business and tech leaders.

Getty Images; Tyler Le/BI

I'm an 82-year-old real-estate broker and forklift driver. I have no plans to retire — they'll have to drag me out.

Tech Insider : Economy, Business, Travel
Bill Miller
Bill Miller still works as a real estate broker and forklift driver.

Katie Linsky Shaw for BI

I co-own Ballerina Farm. I start my day praying with my 8 kids and end it with a tallow skincare routine.

Tech Insider : Business, Sports, Travel
Hannah Neeleman
Hannah Neeleman, 35, is a content creator and cofounder of Ballerina Farm, a 328-acre farm, lifestyle brand, and farm goods store.

Niki Chan Wylie for BI

This as-told-to essay is based on a conversation with Hannah Neeleman, 35, the cofounder of Ballerina Farm, a 328-acre Utah farm, lifestyle brand, and farm goods store.

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